Math, asked by khushi12532, 1 year ago

Kindly solve this question by cross multiplication method. Ritu can row downstream 20 km in 2 hours and upstream 4 kn in 2 hours. Find her speed of rowing in still water and speed of the current

Answers

Answered by ymp1705
1

Answer:

let the speed of boat in still water be 'x'

let the speed of stream be 'y'

downstream = x+y

upstream = x-y

20/x+y = 2

20 = 2(x+y)

20/2=x+y

10=x+y  ---------------------(i)

4/x-y=2

4=2(x-y)

4/2=x-y

2=x-y

x=2+y---------------------(ii)

substituting (ii) in (i)

10=x+y

10=2+y+y

10=2+2y

10-2=2y

8=2y

y=8/2

∴y=4

now x=2+y

x=2+4

∴x=6

∴speed of boat in still water = 6km/hr

speed of stream = 4km/hr


khushi12532: It's to be answered by cross multiplication method :/
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